diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index b84ebcae6e..3e00a9ead1 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -506,8 +506,11 @@ static uint64_t do_paired_cmpxchg64_be(CPUARMState *env, uint64_t addr,
     Int128 oldv, cmpv, newv;
     bool success;
 
-    cmpv = int128_make128(env->exclusive_val, env->exclusive_high);
-    newv = int128_make128(new_lo, new_hi);
+    /* high and low need to be switched here because this is not actually a
+     * 128bit store but two doublewords stored consecutively
+     */
+    cmpv = int128_make128(env->exclusive_high, env->exclusive_val);
+    newv = int128_make128(new_hi, new_lo);
 
     if (parallel) {
 #ifndef CONFIG_ATOMIC128